Python使用进度条表示工作进度

GUI用的是Tkinter，在主线程执行，子线程是工作线程

"""
ttk.Progressbar demo, with multi-threading

author: nn0p 
data: 2013.04.24
"""

from Tkinter import *
import ttk
import threading
import random
import time

class UIThread:
    def __init__(self, root, count=10):
        self.count = count
        self.value = 0
        self.b_exit = False

        self.root = root
        self.event = threading.Event()

        self.pbar = ttk.Progressbar(root, length=200, maximum=count)
        self.pbar.pack()

        root.after(0, self.update)

    def set_max(self, max):
        self.pbar.config(maximum=max)

    def set_val(self, val):
        self.value = val
        
    def start(self):
        self.event.set()

    def stop(self):
        self.b_exit = True

    def update(self):
        print 'waiting...'
        self.event.wait()
        print 'start progress...'
        while 1:            
            self.pbar.config(value=self.value)
            self.pbar.update()

            if self.b_exit:
                break

        self.root.quit()
        print 'root quit()'

    def increase(slef):
        self.value += 1

def work_func(count, ui):
    ui.set_max(count)
    ui.start()

    print '->working<-'
    for i in range(1, count+1):
        rnd_t = random.uniform(.2, .5)
        print i, threading.currentThread().getName(), ':', time.ctime()
        ui.set_val(i)
        
        time.sleep(rnd_t)

    ui.stop()

if __name__ =='__main__':
    root = Tk()
    ui = UIThread(root)

    work_thread = threading.Thread(target=work_func, args=(5, ui))
    work_thread.start()

    root.mainloop()
    work_thread.join()

    raw_input('Press return...')